Time-dose-mortality model of four microbial insecticides on Ourapteryx nigrociliaris Leech
To identify microbial pesticides suitable for controlling Ourapteryx nigrociliaris and develop biocontrol strategies for pests damaging Cephalotaxus sinensis and other medicinal plants,the laboratory toxicities of Mamestra brassicae nuclear polyhedrosis virus,Bacillus thuringiensis,Beauveria bassiana,and Metarhizium anisopliae strain CQMa421 against O.nigrociliaris larvae were measured by using the dipping method.A time-dose-mortality model(TDM)was established and validated using the Hosmer-Lemeshow test.The highest corrected mortality rates of the four microbial pesticides reached 79.31％,86.21％,93.10％,and 72.41％,respectively.The LC50 values were determine as 1.81×106 PIB/mL,2.71×103 IU/mL,9.40×106 spores/mL,and 9.86×106 spores/mL,respectively.Considering both mortality rate and speed of mortality,B.bassiana,B.thuringiensis,and Mamestra brassicae nuclear polyhedrosis virus demonstrated superior insecticidal efficacy compared to M.anisopliae strain CQMa421,demonstrating higher potential for application.This study provides valuable insights for the biocontrol of O.nigrociliaris.
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